Joomla Template Modification

Unfortunately my site's template was created using tables. I need this problem fixed by someone with a proven track record with Joomla templates. I will provide a PSD for slicing if desired. This is the scope of the project:

- Assess whether to customize the existing template or start from scratch.

- Duplicate the old template if using it as a base, before making any changes.

- Use CSS where tables were previously used in layout.

- Add a module position for the Flash banner.

- Keep all visual features intact and correct any bugs which may occur as a result of the change.